Removing kitchen drain pipe from wall

The metal nut that connects the kitchen drain pipe has cracked and is leaking. I can't remove the drain pipe from the wall so I can slide a new nut over the pipe. It seems to have a plastic washer firmly wedged in there or maybe it's rusted together. I've tried to turn the bare pipe with a pipe wrench to loosen it up but the wrench won't grip the bare pipe. What should I do?

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Removing kitchen drain pipe from wall

Okay, I would cut the brass trap arm even with the end of the steel pipe sticking out of the wall, and get a "fernco" adapter-1 1/2" pipe size x 1 1/2" outside diameter tubing and use that to connect the two.

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Removing kitchen drain pipe from wall

Quote:

Okay, I would cut the brass trap arm even with the end of the steel pipe sticking out of the wall, and get a "fernco" adapter-1 1/2" pipe size x 1 1/2" outside diameter tubing and use that to connect the two.

Are you thinking I shouldn't try to pull the trap arm out of the wall because I could cause a leak behind the wall? I'm on the third floor in an apartment building.

How would you cut the trap arm? I'd really rather not do that though since I'm renting. Can I connect a Fernco adapter below the trap arm "lip"?